Youhei Numata, Surya Prakash Singh, Ashraful Islam, Munetaka Iwamura, Atsushi Imai, Koichi Nozaki and Liyuan Han Enhanced Light-Harvesting Capability of a Panchromatic Ru(II) Sensitizer Based on π-Extended Terpyridine with a 4-Methylstylryl Group for Dye-Sensitized Solar Cells Advanced Functional Materials 23
Moderate electron-donating substituents are important for enhancement of the light harvesting capability of Ru(II) sensitizers. Substitution of a terpyridyl ligand with a 4-methylstyryl group increases the molecular absorption coefficient from the UV to the NIR region compared with black dye owing to the wider lowest unoccupied molecular orbital (LUMO) distributed over the terpyridyl and extended π-conjugation. The intense absorption gives a high JSC of 23.07 mA cm−2, and a resulting overall conversion efficiency of 11.1%.
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